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Acquired and Covered Loans (Details) - Changes in Accretable Yield - Receivables acquired with deteriorated credit quality - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Changes in Accretable Yield [Roll Forward]      
Beginning balance $ 24,912 $ 28,244 $ 36,792
Additions 3,981 1,168 3,517
Accretion (8,063) (11,311) (12,535)
Other [1] (1,444) 6,811 470
Ending balance $ 19,386 $ 24,912 $ 28,244
[1] Decreases result from the resolution of certain loans occurring earlier than anticipated while increases represent a rise in the expected future cash cash flows to be collected over the remaining estimated life of the underlying portfolio.